Hertz Dieci DS 30.3 (SVC 4 ohm)

12″ subwoofer · 4 Ω · 250 W RMS

Fs 32 HzQts 0.62Vas 2.47 ft³Xmax 0.35″

Recommended box

For a sedan, one sub, 250 W. It’s the same math as the designer’s step-by-step mode, where you can fit the box to your space, vehicle and amp and get plans, a cut sheet and DXF.

Sealed

Net volume1.84 ft³ (52 L)
Qtc0.96
Fc49 Hz
F3 (−3 dB, no cabin gain)41 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 3/16″
Open sealed box in designer

Ported

Net volume3.14 ft³ (89 L)
Tuning (Fb)35 Hz
Portslot 1 9/16 × 14 5/16″, 11 3/4″ long
Port velocity at 250 W61 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 1/4″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32 Hz
Qts0.62
Qes0.71
Qms5.14
Vas2.47 ft³
Re3.3 Ω
Sd81 in²
Xmax0.35″
Vd28.7 in³ calc.
Mms137 g calc.
BL11.3 T·m calc.
EBP45 — suits sealed calc.
Sensitivity, 1 W / 1 m87.1 dB calc.

General

Size12″
Voice coils4 Ω
RMS power250 W

Mounting dimensions

Ø12 1/16″cutout Ø11″mounting depth 4 3/4″magnet Ø4 1/2″
Cutout diameter11″
Mounting depth4 3/4″
Overall diameter12 1/16″
Magnet diameter4 1/2″

“≈” means the value isn’t in the spec sheet and a typical value for the size is used; “calc.” means it’s calculated from the published parameters. Check the manufacturer’s spec sheet before you build.

Data sources

Other Hertz 12″ models